Qt in my own car/device product

prsolucoes

Hi,

I have some questions about qt and distribution inside my car/device.

I want build inside a raspberry a dashboard application that will show car info and and car controls. It will be a Qt app and Linux.

My question is about license. I can make it for free using LGPL or GPL license? Or need buy it?

Thanks.

tekojo

Hi, and welcome to the forums!

If you want to build something for your own use, the free licenses are the best option.

The commercial license is for commercial use. So if you for instance make a business out of dashboard applications, then look at the commercial license.

prsolucoes

It is so confusing.

With the free license i can build my qt app and sell inside a raspberry pi 3 in my business?

Thanks.

tekojo

So you want to make a commercial embedded project.
I would recommend a commercial Qt license, as it is the simplest way.

Technically you can do commercial projects with the LGPL license, but then you need to understand the LGPL license and commit to the requirements it sets. https://www.gnu.org/licenses/lgpl-3.0.en.html

prsolucoes

I understand somethings:

1 - I can use free licenses version for a commercial project. But if i modify the Qt source i need send the modifications to the Qt owners (no problem).

2 - I can sell my software using Qt using free licenses if i respect GPL license without pay anything to Qt owners.

So it is correct?

jsulm

@prsolucoes You really should ask "The Qt Company" and not base your decision on an answer you get in a forum. I'm quite sure most/all people here are not lawyers.

tekojo

@prsolucoes you are simplifying too much. Please read the GPL and LGPL licenses through. Those are the documents you need to follow if you go with open source.

The point of the different GNU licenses is to make sure that the user has:

the freedom to use the software for any purpose,
the freedom to change the software to suit your needs,
the freedom to share the software with your friends and neighbors, and
the freedom to share the changes you make.

https://www.gnu.org/licenses/quick-guide-gplv3.html (The quick guide to GPLv3)

It's all about the users rights.

prsolucoes

Thanks @tekojo , you are the best.